Improvement in steam-generators



.l dilated States @anni @titille CHARLES SRING, OF HYDE PARK, AND ANDREW SPRING, OF WESTON,

MASSACHUSETTS.

Letters Patent No. 103,793, dated May 31, 1870.

IMPROVEMENT IN STEAM-GBNERATORS.

Vis a description of our invention suicient to enable those skilled in the art t'o practice it.

This invention has particular reference to a detail of construction of that class of upright steam-generators or'boilers, in which a series of vertical waterd pipes extend through the hot air or combustion-chamber of the furnace, these pipes branching laterally from main vertical water-chambers at the sides of the boiler, and leading into the common steam-chamber at the top of the boiler.

Our invention consists in extending a vertical Huepipe through each or either of the main or auxiliary steam and hot-water chambers, such flue or flues leading from the top of the main combustion-chamber or dome, and passing out into the chimney at any suitable point.v f

The drawings represent one ofthe sections of a sectional steam-generator embodying our invention.

,A shows a vertical section through one set of the pipes.

B is a horizontal section of the same.

a denotes the fire-pot.

b, the grate thereof.

c, the hot-air chamber over the tire-pot, and within the walls, d, the heated air, smoke, and other volatile products of combustion filling this chamber and rising into the dome e, and then esca-ping `by the main Hue f. l

On each side of the fire-pot, or between each side thereof and the adjacent wall d, is a main water-pipe or chamber, g, the two pipes extending under the repot and joining, as seen at A, and each extending up to the top of the furnace and into a common steamchamber',` h, as also seen at A.

Directly over the re-pot two water-pipes i i, branch Vfrom the opposite main pipes q g, uniting and. leading the steam-chamber or dome h, there being any suitable number of the pipes l fm, in accordance with the width of the furnace, and there being left, between' the adjacent surfaces of all of the pipes, a narrow vertical hotair'space, n, forming part of the combustionfohamber, each section of the boiler' composed of the water and steam-pipes, and chambers g, i, k, l, m, and 71, being preferably cast integral or in one casting, and the adjacent sections being united by suitable hot water or steam-pipes, or couplings, at o and p,

so that any desirable number of these sections can be associated in range torform `one steam-generator, the grate-bars b extending from section to section, and the furnace-walls being extended to correspond to the number ofscctions employed.

Neither the' `construction and organization ofthe pipes of each section, nor of' the united sections, is of our invention, but it is particularly to such construction and organization that our improvement relates.

It iswell known that there is always a great waste of caloric, which escapes into the chimney with the volatile products of combustion. our invention to utilize the caloric after it reaches the top of the main hot-air chamber, by diverting the currents of smoke, dic., from their passage into the main flue leading it therefrom, by suitable pipes through the main hot-water pipes. 'lo accomplish this, we place in the main due a damper, q, and from the dome or upper part of the combustion-chamber e, we lead one or more due-pipes fr, carrying such pipe down through onewater-chamber g, and across to and up through the other, as seen at A, and thence out into the Ymain ue, or we lead a pipe from the dome-chamber e, down through each chamber g, and from the bottom of such chamber into the ue.

Vithin the chamber l1., these flue-pipes areentirely surrounded by steam and water, and, when the damper q is closed, the volatile products of combustion can only escape through these due-pipes, and in their passage their calorio will be imparted to the steam and water surrounding the pipes.

When the re is started or needs to be quickened, the-damper q is opened, and the dames, smoke, Ste., escape directly into the main dues; but when lthe fire is well established, 'the damper is closed, and the products of combustion pass through the flue-pipes l1', as described.

At the foot of each tine-pipe o', (preferably in. line with the horizontal part s thereof,) the pipes may be provided with suitable hand-holes andplugs, for the purpose of cleaning out the ilues from sooty deposits, the Water-pipes g being provided with suitable handholes and plugs opposite thereto.

It will be obvious that either of the hot water and steam-chambers, or each of them, -may have a fluepipe thus passing through it, the said pipes leading 1one into another, or from' the main hot-air chamber and thence or finally into the main ue.

It will also be obvious-that these auxiliary flue- It is the purpose of I pipes may run froml section to section of the boiler, the same as do the water `and steam-couplings o p, such connections being made by lateral fine-pipes t u, extending from section to section, the fines of the last section connecting with themain tine-pipe t'.

The direction ofthe fine-currents may be regulated byslide dampers, as seen at w and x.

Each damper w has a close disk, y, at its inner end, and an open or perforated disk, z, at some distance therefrom. The dampers being arranged as seen in the drawing, the smoke and other products 'ofv combustion, entering the top of the right-hand flue, will pass down through the same, across through the bottom ne and up through the left-hand iiue, and, through the damper x, into the main due-pipe c, as

denoted by the arrows. Or, if the damper e: be opened and the dampers w pushed in, the current will pass down both vertical fiue-pipes r, and out into the main fine through the perforations inthe disk z.

The inner and outer pipes maybe differently disposed from the arrangement shown in the drawing, and the arrangement of inner and outer pipes may be used for changing the temperature of any uid in one pipe, by passing through the other pipe a fluid of different temperature.

Instead of passing one pipe directly through the other, itmay pass down at the side thereof, or a pipe bedivided by a longitudinalI partition, the hot Water or other uid passing through the chamber formed on one side of the partition, and the hot air or other fluid through the chamber on the opposite side thereof.

We claim- In combination with the main duid-holding pipes, the auxiliary pipes r, or their equivalents, substantially as described.

Also, connecting two or more series of pipes having such auxiliary dues, by lateral lues t u.

Also, in combination with the auxiliary pipes 1*-, the hand-holes and plugs for cleaning the fines, .substantially as described.

Also, in combination with the auxiliary pipes lr, the dampers w x, for changing the currentv through the fines, substantially as described.

CHARLES SPRING. ANDREW SPRING.

Witnesses FRANCIS Gouw, M. W. FROTHINGHAM. 

